Yealink SIP-T48G Administrator's Manual page 109

A dialog box pops up to prompt "Firmware of the SIP Phone will be updated. It will
take 5 minutes to complete. Please don't power off!".
4. Click OK to confirm the upgrade.
Note
Do not close and refresh the browser when the IP phone is upgrading firmware via web
user interface.
IP phones support using FTP , TFTP , HTTP and HTTPS protocols to download configuration
files and firmware from the provisioning server, and then upgrade firmware
automatically.
IP phones can download firmware stored on the provisioning server in one of two ways:
Check for configuration files and then download firmware during startup.

Automatically check for configuration files and then download firmware at a fixed

interval or specific time.
Method of checking for configuration files is configurable.
Procedure
Configuration changes can be performed using the configuration files or locally.
Configuration
File
<y0000000000xx>.cfg
Configure the way for the IP phone to
check for configuration files.
Parameters:
auto_provision.power_on
auto_provision.repeat.enable
auto_provision.repeat.minutes
auto_provision.weekly.enable
auto_provision.weekly.begin_time
auto_provision.weekly.end_time
Getting Started
89